Troubleshooting
9
Nordson Corporation 1994
All Rights Reserved
108 129
Issued 3/94
Manual No. 31
−
13
WARNING
: Before performing any of the following
procedures, shut OFF all electrical power at a disconnect
switch or breaker ahead of the power supply or master control
module. Ground the electrode before removing the gun from
the mounting bar.
Problem
Possible Reason
Corrective Action
Refer to
Uneven pattern,
unsteady or inad-
equate powder
flow.
Blockage in gun, feed hose, or pump. Remove feed hose from pump and
blow out with compressed air. If nec-
essary, disassemble gun and pump
and clean.
Page 7
Deflector or nozzle worn, or impact
fusion affecting pattern.
Remove deflector and/or nozzle,
clean, and inspect. Replace worn
parts. If parts are wearing exces-
sively or impact fusion is a problem,
reduce air pressure.
Page 11
Damp powder
Check the powder supply, air filters
and dryer. Replace powder supply if
contaminated.
Low atomizing or flow rate air pres-
sure.
Increase atomizing and/or flow rate
air pressure.
Improper fluidization of powder in
hopper.
Increase fluidizing pressure, remove
powder from hopper and clean fluid-
izing plate, if necessary.
Voids in powder
pattern.
Worn nozzle or deflector.
Disassemble gun and inspect parts,
replace if necessary.
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Plugged gun orifices.
Disassemble gun and clean.
Page 11
Loss of wrap,
poor efficiency.
Output voltage insufficient.
Increase output voltage. Refer to
power supply manual.
Cable assembly or electrostatic pow-
er supply failure.
Check cable assembly with megohm-
meter for 332-456 M
at 500 V. Re-
fer to power supply manual for multi-
plier test procedures.
Page 7
Poorly grounded workpieces.
Stop conveyor and check chain, roll-
ers and hangers for powder buildup.
Clean and check for 1 M
or less re-
sistance between workpiece and
ground.
5. Troubleshooting
